One of the funniest thing my cat ever did involved this. She was "dozing" on my lap with her head pointed toward the TV. At a point, she fell into a deep sleep because her head bobbled from side to side a couple times then fell down! It didn't even wake her up! I almost died holding my laughter inside. It was like when humans are sitting up doing the head bobble and just catching themselves before their head falls. Only her head did fall.